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Join up to 35 other "Islanders" on the "Big Kahuna," a 49-foot, Hawaiian-themed party boat where you can mix up a margarita with your favorite BYOB tequila, enjoy the complimentary fajita bar, and admire the city skyline while partying down the Chicago River:

• $75 ($125 value) for one ticket to a BYOB party boat cruise
• Margarita mixers and access to the complimentary fajita bar are included
• Departs from Monroe Harbor at 6:30 p.m. every Thursday from May 28 to Sept. 11